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Ghana international Michael Essien suffered a knee injury during training, forcing new Chelsea boss Andre Villas-Boas into looking the way of his old club for Joao Moutinho.
Blues fear the key midfielder has again damaged knee ligaments and will be out for at least six months and possibly the entire campaign. That would be a huge blow for Villas-Boas just three days into pre-season training. Essien's likely long-term absence will force him to reassess his transfer plans.
Essien has been plagued by problems, missing virtually the entire 2008-09 season after anterior cruciate ligament damage to his right knee.